/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * SpelApplet.java
 *
 * Created on 2009-feb-17, 09:27:49
 */

package mittforstaspel;

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.logging.Level;
import java.util.logging.Logger;



/**
 *
 * @author karlssoj
 */
public class SpelApplet extends Applet implements Runnable, MouseListener
{
    //GLOBALA VARIABLER, SÄTT IN I BÖRJAN AV APPLET-KLASSEN
	Image dbImage;	//deklarerar en Image variabel dit en osynlig kopia av applet-grafiken sparas
	Graphics dbg;	//deklarerar Graphics variabel dit alla grafik-egenskaper för appleten sparas



    /** Initializes the applet appletKlass */
    @Override
    public void init()
    {
        try {
            java.awt.EventQueue.invokeAndWait(new Runnable()
            {
                public void run() {
                    //initComponents();
                }
            });
        } catch (Exception ex) {
            ex.printStackTrace();
        }

       setBackground(Color.CYAN);
      
       Boll.tr = Executors.newCachedThreadPool();

       Lista.forsta = new Lista();
       Lista nuv = Lista.forsta;
       Boll.applet = this;
       
       for(int i = 0; i < 6; i++, nuv = nuv.nasta)
       {
                Lista foljande = new Lista();
                nuv.b = new Boll();
                nuv.nasta = foljande;
       }
       nuv.nasta = null;

       Boll.tr.submit(this);
       addMouseListener(this);
    }

	//Denna metod anropas av repaint(
    @Override
	public void update (Graphics g)
	{
		//Initialiserar den osynliga kopian av grafiken
		if (dbImage == null)
		{
			//skapar en tom "image" med samma storlek som innevarande applet
			dbImage = createImage(this.getSize().width, this.getSize().height);
			//hämtar grafikegenskaper
			dbg = dbImage.getGraphics();
		}

		//Tömmer skärmen i bakgrunden
		dbg.setColor (getBackground());
		dbg.fillRect (0, 0, this.getSize().width, this.getSize().height);

		//Ritar grafiken pånytt i bakgrunden
		dbg.setColor(getForeground());
		paint(dbg);

		//Ritar den uppdaterade bilden på bildskärmen
		g.drawImage(dbImage, 0, 0, this);
	}


    @Override
    public void paint(Graphics grafik)
    {
        //grafikfunktioner hit
        for(Lista nuv = Lista.forsta; nuv.nasta != null; nuv = nuv.nasta)
        {
            grafik.setColor(nuv.b.farg);
            grafik.fillOval(nuv.b.x, nuv.b.y, nuv.b.diameter, nuv.b.diameter);
        }

        grafik.setColor(Color.BLACK);
        grafik.drawString(Integer.toString(Boll.antal), 10, 10);
    }

    public void run()
    {
       while(true)
       {
            try
            {
                repaint();
                Thread.sleep(Boll.vanteTid);
            }
            catch (InterruptedException ex)
            {
                //Logger.getLogger(SpelApplet.class.getName()).log(Level.SEVERE, null, ex);
            }
       }
    }


    public void mouseClicked(MouseEvent e)
    {

    }

    public void mousePressed(MouseEvent e)
    {
        Lista foregaende = Lista.forsta;

        for(Lista nuv = Lista.forsta; nuv.nasta != null; nuv = nuv.nasta)
        {
            if( (e.getPoint().x - nuv.b.x) <= nuv.b.diameter && (e.getPoint().y - nuv.b.y) <= nuv.b.diameter)
            {
                if( (e.getPoint().x - nuv.b.x) >= 0 && (e.getPoint().y - nuv.b.y) >= 0)
                {
                       nuv.b.stat.cancel(true);
                       foregaende.nasta = nuv.nasta;
                       Boll.antal--;
                       if(nuv == Lista.forsta) Lista.forsta = nuv.nasta;
                       nuv = null;
                }
            }
            
            foregaende = nuv;
        }
    }

    public void mouseReleased(MouseEvent e)
    {

    }

    public void mouseEntered(MouseEvent e)
    {

    }

    public void mouseExited(MouseEvent e)
    {

    }


    /** This method is called from within the init() method to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    /*
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );
    }// </editor-fold>                        
*/

    // Variables declaration - do not modify                     
    // End of variables declaration                   

}

class Lista
{
    Boll b;
    Lista nasta;
    static Lista forsta;
}

class Boll implements Runnable
{
    int x, y, diameter, xrikt, yrikt, xy[][] = new int[4][2], id = 0;
    static int vanteTid, antal = 0;
    Future stat;
    Color farg;
    static Applet applet;
    static ExecutorService tr;
    Random generator = new Random();

    public Boll()
    {
        id = antal;
        antal++;

        do
        {
            xrikt = generator.nextInt(4) - 2;
            yrikt = generator.nextInt(4) - 2;
        }
        while(xrikt == 0 && yrikt == 0);
        
        vanteTid = 10;
        diameter = generator.nextInt(30) + 30;

        do
        {
            x = generator.nextInt(applet.getWidth() - diameter);
            y = generator.nextInt(applet.getWidth() - diameter);
        }
        while(krocktest(true));

       

        farg = new Color(generator.nextInt(256),generator.nextInt(256),generator.nextInt(256));
        stat = tr.submit(this);
    }

	public int diff(int a, int b)
	{
		if(a > b)	return a - b;
		else		return b - a;
	}


    public void move()
    {
        if(x > applet.getWidth() - diameter)   {x = applet.getWidth() - diameter; xrikt*=-1;}
        if(x < 0)                   {x = 0; xrikt*=-1;}
        if(y > applet.getHeight() - diameter)   {y = applet.getHeight() - diameter; yrikt*=-1;}
        if(y < 0)                   {y = 0; yrikt*=-1;}

        x+=xrikt;
        y+=yrikt;
    }


   public boolean krocktest(boolean forsta)
   {
        for(Lista nuv = Lista.forsta; nuv.nasta != null; nuv = nuv.nasta)
        {
            int mittpX1 = nuv.b.x + nuv.b.diameter/2;
            int mittpY1 = nuv.b.y + nuv.b.diameter/2;
            int mittpX2 = x + diameter/2;
            int mittpY2 = y + diameter/2;
            int minAvst = nuv.b.diameter/2 + diameter/2;

            if(diff(mittpX1, mittpX2) <= minAvst && diff(mittpY1, mittpY2) <= minAvst && this != nuv.b)
            {
               
                if(antal < 20 && !forsta)
                {
                    Lista nyForsta = new Lista();               
                    nyForsta.b = new Boll();
                    nyForsta.nasta = Lista.forsta;
                    Lista.forsta = nyForsta;
                }

                xrikt *= -1;
                yrikt *= -1;
               
                return true;
            }
        }
        return false;
    }

    public void run()
    {
        while(true)
        {
            move();
            krocktest(false);

            try
            {
               
                Thread.sleep(vanteTid);
            }
            catch (InterruptedException ex)
            {
                //Logger.getLogger(Boll.class.getName()).log(Level.SEVERE, null, ex);
                break;
            }

        }
    }
}